Which SnapMirror relationship should you create in the snapmirror.conf file for a SnapManager for Exchange configuration?

A.
filer1:vol1 filer2:vol1 – * * * *

B.
filer1:vol1 filer2:vol1 – – – – –

C.
filer1:vol1 filer2:vol1 – 15,30 * * *

D.
filer1:vol1 filer2:vol1 * * * * *